Answer:
A. 20%
Step-by-step explanation:
These events are independent, because if David eats a healthy breakfast cannot influence on would be rain or not.
"And" for probabilities of independent events means "x" (times).
80% = 0.8
25% = 0.25
0.8*0.25 = 0.2 = 20%
So we know if there are 5 groups/dozens of Monarch butterflies, there are 2 groups/dozens of Queen butterflies. In other words, there are 5 Monarch butterflies for every 2 Queen butterflies.
Then we can turn that into an equation.

From the last equation we wrote we can see that the total number of butterflies in the farm is

.
When we compare the Queen butterflies to total butterflies, we get

The ratio of Queen butterflies to total butterflies is 2:7.